Onosta Company International

Who We Are

ONOSTA INTERNATIONAL COMPANY LIMITED is a proudly Nigerian-owned engineering and energy solutions firm established in 1989. For over 36 years, we’ve delivered cutting-edge services in power systems, oilfield maintenance, renewable energy, and turnkey industrial projects for the Oil & Gas sector and beyond.

🇳🇬 100% Indigenous & Operational Since 1989
⚡ Leaders in Power, Renewable Energy & Oilfield Systems
🤝 OEM Partnerships + Proven After-Sales Support

Projects Delivered Nationwide

Years of Engineering Excellence

Client Retention Rate

Our Services

Power Systems Procurement

Procurement and supply of high-quality, industry-grade power systems equipment.

Installation & Commissioning

Expert installation, synchronization, and commissioning for optimal power system performance.

O&M Services

Reliable operation and maintenance solutions for long-term system efficiency and uptime.

Custom Power Solutions

Tailored engineering and energy solutions to meet industry-specific demands.

Trusted by Nigeria’s Energy & Industrial Leaders

ONOSTA INTERNATIONAL COMPANY is a preferred engineering partner for top-tier Oil & Gas companies, power firms, and government-backed energy initiatives.

Featured Projects

Delivering measurable value through power generation, overhaul services, and oilfield excellence.

LSD605 – Caterpillar D399 Generator Overhaul

Offshore Rig-205 • Lonestar Drilling Ltd • Completed: 31 Dec 2007

Complete overhaul of 1PC D399 60Hz, 600V Caterpillar Generator Set with supply of overhaul spares.

Project #3500002829 – Perkins 500kVA Diesel Gen Set

Port Harcourt • NAOC Residential Quarters • Completed: 24 Mar 2005

Installation of 1PC P500PI/SA 500kVA Soundproof Perkins Diesel Generator Set for residential operations.

DC 65/9/33660 – G3412 CAT Gas Engine Project

Forcados Terminal • SPDC Field • Completed: 16 Mar 2000

Supply and commissioning of 256kW / 320kVA G3412 CAT soundproof gas engine for continuous operation.

View More Projects

Trusted by Industry Leaders

Hear from key clients in power, oil & gas, and renewable energy who trust ONOSTA to deliver infrastructure that drives Africa’s future.

“

ONOSTA delivered our substation upgrade flawlessly, exceeding international benchmarks and maintaining 100% compliance with our safety protocols.

– Engineering Director, National Power Authority

“

The reliability and technical depth of ONOSTA's offshore team during our rig refurbishment was outstanding. They understand oil & gas like no other local partner.

– Project Manager, Shell Nigeria

“

ONOSTA’s solar farm integration project helped us scale clean energy access in three states. Their professionalism and speed of execution were world-class.

– Energy Transition Lead, REA

“

We’ve relied on ONOSTA since 2001 for generator commissioning and emergency systems at our Port Harcourt facility. They’ve never failed to deliver.

– Facility Head, NAOC

“

ONOSTA’s electrical panel fabrication and rewiring on our Egbema field project was precise, fast, and fully compliant. Highly recommended for brownfield work.

– HSE & Maintenance Coordinator, Seplat Energy

ONOSTA: Your Power. Our Expertise.

From power systems to oilfield maintenance, our experienced engineers are ready to help you deliver your next critical infrastructure project — on time.

Email: info@onostaintl.com

Phone: +2348023275074 +2348036123743

Address: 277 Warri–Sapele Road, Warri, Delta State, Nigeria

Get in Touch

Powering Industries Since 1989